As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#939, JFK-SJD. (AIRCRAFT PERFORMED AN AIR TURN ABCK TO JFK) 'AIR ENG 2 BLEED ABNORMAL PR; REF AML 3758745-1 (INSTALLED PRSOV VALVE ON ENG 2 IAW AMM 36-11-52. OPS CHECK GOOD SENSE LINE WAS INSTALLED AND LEAK CHECK GOOD IAW 36-11-00) PRSOV AND SENSE LINE REPLACED ON ENG 2.'